Jaynagar Lok Sabha constituency or Joynagar Lok Sabha constituency is one of the 543 Parliamentary constituencies in India. The constituency centres on Jaynagar Majilpur in West Bengal. All the seven legislative assembly segments of No. 19 Jaynagar Lok Sabha constituency are in South 24 Parganas district. The seat is reserved for Scheduled Castes.
As per order of the Delimitation Commission regarding the delimitation of constituencies in West Bengal, the Jaynagar Lok Sabha constituency is composed of the following legislative assembly segments from 2009:
|- ! style="background-color:#E9E9E9;text-align:left;" width=225 |Party ! style="background-color:#E9E9E9;text-align:right;" |Seats won ! style="background-color:#E9E9E9;text-align:right;" |Seat change ! style="background-color:#E9E9E9;text-align:right;" |Vote percentage |- | style="text-align:left;" |Trinamool Congress | style="text-align:center;" | 19 | style="text-align:center;" | 18 | style="text-align:center;" | 31.8 |- | style="text-align:left;" |Indian National Congress | style="text-align:center;" | 6 | style="text-align:center;" | 0 | style="text-align:center;" | 13.45 |- | style="text-align:left;" |Socialist Unity Centre of India (Communist) | style="text-align:center;" | 1 | style="text-align:center;" | 1 | style="text-align:center;" | NA |- |- | style="text-align:left;" |Communist Party of India (Marxist) | style="text-align:center;" | 9 | style="text-align:center;" | 17 | style="text-align:center;" | 33.1 |- | style="text-align:left;" |Communist Party of India | style="text-align:center;" | 2 | style="text-align:center;" | 1 | style="text-align:center;" | 3.6 |- | style="text-align:left;" |Revolutionary Socialist Party | style="text-align:center;" | 2 | style="text-align:center;" | 1 | style="text-align:center;" | 3.56 |- | style="text-align:left;" |Forward bloc | style="text-align:center;" | 2 | style="text-align:center;" | 1 | style="text-align:center;" | 3.04 |- | style="text-align:left;" |Bharatiya Janata Party | style="text-align:center;" | 1 | style="text-align:center;" | 1 | style="text-align:center;" | 6.14 |-
Most of the contests were multi-cornered. However, only winners and runners-up are mentioned below: